6255719370781 has 2 divisors, whose sum is σ = 6255719370782. Its totient is φ = 6255719370780.

The previous prime is 6255719370779. The next prime is 6255719370787. The reversal of 6255719370781 is 1870739175526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3418967412025 + 2836751958756 = 1849045^2 + 1684266^2 .

It is a cyclic number.

It is not a de Polignac number, because 6255719370781 - 2¹ = 6255719370779 is a prime.

It is a super-2 number, since 2×6255719370781² (a number of 26 digits) contains 22 as substring.

Together with 6255719370779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6255719370787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3127859685390 + 3127859685391.

It is an arithmetic number, because the mean of its divisors is an integer number (3127859685391).

Almost surely, 2^{6255719370781} is an apocalyptic number.

It is an amenable number.

6255719370781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6255719370781 is an equidigital number, since it uses as much as digits as its factorization.

6255719370781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22226400, while the sum is 61.

The spelling of 6255719370781 in words is "six trillion, two hundred fifty-five billion, seven hundred nineteen million, three hundred seventy thousand, seven hundred eighty-one".